Susan,
You live in Arizona, right?

Google 'radon in Arizona'. You will find plenty of info.

Radon contamination has become an issue is different parts of the country - for cellars of homes, water supply, farming, etc. Some folks are extremely sensitive and swear that it negatively impacts their daily lives. Cross check some of the symptoms with what you have been experiencing and see what you think.

One other thought. If you are applying for SSDI, you may not want your doc to officially decrease your medication at this time.